1#!/bin/sh
  2#
  3# link vmlinux
  4#
  5# vmlinux is linked from the objects selected by $(KBUILD_VMLINUX_INIT) and
  6# $(KBUILD_VMLINUX_MAIN). Most are built-in.o files from top-level directories
  7# in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
  8# Ordering when linking is important, and $(KBUILD_VMLINUX_INIT) must be first.
  9#
 10# vmlinux
 11#   ^
 12#   |
 13#   +-< $(KBUILD_VMLINUX_INIT)
 14#   |   +--< init/version.o + more
 15#   |
 16#   +--< $(KBUILD_VMLINUX_MAIN)
 17#   |    +--< drivers/built-in.o mm/built-in.o + more
 18#   |
 19#   +-< ${kallsymso} (see description in KALLSYMS section)
 20#
 21# vmlinux version (uname -v) cannot be updated during normal
 22# descending-into-subdirs phase since we do not yet know if we need to
 23# update vmlinux.
 24# Therefore this step is delayed until just before final link of vmlinux.
 25#
 26# System.map is generated to document addresses of all kernel symbols
 27
 28# Error out on error
 29set -e
 30
 31# Nice output in kbuild format
 32# Will be supressed by "make -s"
 33info()
 34{
 35	if [ "${quiet}" != "silent_" ]; then
 36		printf "  %-7s %s\n" ${1} ${2}
 37	fi
 38}
 39
 40# Thin archive build here makes a final archive with
 41# symbol table and indexes from vmlinux objects, which can be
 42# used as input to linker.
 43#
 44# Traditional incremental style of link does not require this step
 45#
 46# built-in.o output file
 47#
 48archive_builtin()
 49{
 50	if [ -n "${CONFIG_THIN_ARCHIVES}" ]; then
 51		info AR built-in.o
 52		rm -f built-in.o;
 53		${AR} rcsT${KBUILD_ARFLAGS} built-in.o			\
 54					${KBUILD_VMLINUX_INIT}		\
 55					${KBUILD_VMLINUX_MAIN}
 56	fi
 57}
 58
 59# Link of vmlinux.o used for section mismatch analysis
 60# ${1} output file
 61modpost_link()
 62{
 63	local objects
 64
 65	if [ -n "${CONFIG_THIN_ARCHIVES}" ]; then
 66		objects="--whole-archive built-in.o"
 67	else
 68		objects="${KBUILD_VMLINUX_INIT}				\
 69			--start-group					\
 70			${KBUILD_VMLINUX_MAIN}				\
 71			--end-group"
 72	fi
 73	${LD} ${LDFLAGS} -r -o ${1} ${objects}
 74}
 75
 76# Link of vmlinux
 77# ${1} - optional extra .o files
 78# ${2} - output file
 79vmlinux_link()
 80{
 81	local lds="${objtree}/${KBUILD_LDS}"
 82	local objects
 83
 84	if [ "${SRCARCH}" != "um" ]; then
 85		if [ -n "${CONFIG_THIN_ARCHIVES}" ]; then
 86			objects="--whole-archive built-in.o ${1}"
 87		else
 88			objects="${KBUILD_VMLINUX_INIT}			\
 89				--start-group				\
 90				${KBUILD_VMLINUX_MAIN}			\
 91				--end-group				\
 92				${1}"
 93		fi
 94
 95		${LD} ${LDFLAGS} ${LDFLAGS_vmlinux} -o ${2}		\
 96			-T ${lds} ${objects}
 97	else
 98		if [ -n "${CONFIG_THIN_ARCHIVES}" ]; then
 99			objects="-Wl,--whole-archive built-in.o ${1}"
100		else
101			objects="${KBUILD_VMLINUX_INIT}			\
102				-Wl,--start-group			\
103				${KBUILD_VMLINUX_MAIN}			\
104				-Wl,--end-group				\
105				${1}"
106		fi
107
108		${CC} ${CFLAGS_vmlinux} -o ${2}				\
109			-Wl,-T,${lds}					\
110			${objects}					\
111			-lutil -lrt -lpthread
112		rm -f linux
113	fi
114}
115
116
117# Create ${2} .o file with all symbols from the ${1} object file
118kallsyms()
119{
120	info KSYM ${2}
121	local kallsymopt;
122
123	if [ -n "${CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX}" ]; then
124		kallsymopt="${kallsymopt} --symbol-prefix=_"
125	fi
126
127	if [ -n "${CONFIG_KALLSYMS_ALL}" ]; then
128		kallsymopt="${kallsymopt} --all-symbols"
129	fi
130
131	if [ -n "${CONFIG_KALLSYMS_ABSOLUTE_PERCPU}" ]; then
132		kallsymopt="${kallsymopt} --absolute-percpu"
133	fi
134
135	if [ -n "${CONFIG_KALLSYMS_BASE_RELATIVE}" ]; then
136		kallsymopt="${kallsymopt} --base-relative"
137	fi
138
139	local aflags="${KBUILD_AFLAGS} ${KBUILD_AFLAGS_KERNEL}               \
140		      ${NOSTDINC_FLAGS} ${LINUXINCLUDE} ${KBUILD_CPPFLAGS}"
141
142	local afile="`basename ${2} .o`.S"
143
144	${NM} -n ${1} | scripts/kallsyms ${kallsymopt} > ${afile}
145	${CC} ${aflags} -c -o ${2} ${afile}
146}
147
148# Create map file with all symbols from ${1}
149# See mksymap for additional details
150mksysmap()
151{
152	${CONFIG_SHELL} "${srctree}/scripts/mksysmap" ${1} ${2}
153}
154
155sortextable()
156{
157	${objtree}/scripts/sortextable ${1}
158}
159
160# Delete output files in case of error
 
161cleanup()
162{
163	rm -f .old_version
164	rm -f .tmp_System.map
165	rm -f .tmp_kallsyms*
166	rm -f .tmp_version
167	rm -f .tmp_vmlinux*
168	rm -f built-in.o
169	rm -f System.map
170	rm -f vmlinux
171	rm -f vmlinux.o
172}
173
174on_exit()
175{
176	if [ $? -ne 0 ]; then
177		cleanup
178	fi
179}
180trap on_exit EXIT
181
182on_signals()
183{
184	exit 1
185}
186trap on_signals HUP INT QUIT TERM
187
188#
189#
190# Use "make V=1" to debug this script
191case "${KBUILD_VERBOSE}" in
192*1*)
193	set -x
194	;;
195esac
196
197if [ "$1" = "clean" ]; then
198	cleanup
199	exit 0
200fi
201
202# We need access to CONFIG_ symbols
203case "${KCONFIG_CONFIG}" in
204*/*)
205	. "${KCONFIG_CONFIG}"
206	;;
207*)
208	# Force using a file from the current directory
209	. "./${KCONFIG_CONFIG}"
210esac
211
 
 
 
 
 
 
 
212# Update version
213info GEN .version
214if [ ! -r .version ]; then
215	rm -f .version;
216	echo 1 >.version;
217else
218	mv .version .old_version;
219	expr 0$(cat .old_version) + 1 >.version;
220fi;
221
222# final build of init/
223${MAKE} -f "${srctree}/scripts/Makefile.build" obj=init GCC_PLUGINS_CFLAGS="${GCC_PLUGINS_CFLAGS}"
224
225archive_builtin
226
227#link vmlinux.o
228info LD vmlinux.o
229modpost_link vmlinux.o
230
231# modpost vmlinux.o to check for section mismatches
232${MAKE} -f "${srctree}/scripts/Makefile.modpost" vmlinux.o
233
234kallsymso=""
235kallsyms_vmlinux=""
236if [ -n "${CONFIG_KALLSYMS}" ]; then
237
238	# kallsyms support
239	# Generate section listing all symbols and add it into vmlinux
240	# It's a three step process:
241	# 1)  Link .tmp_vmlinux1 so it has all symbols and sections,
242	#     but __kallsyms is empty.
243	#     Running kallsyms on that gives us .tmp_kallsyms1.o with
244	#     the right size
245	# 2)  Link .tmp_vmlinux2 so it now has a __kallsyms section of
246	#     the right size, but due to the added section, some
247	#     addresses have shifted.
248	#     From here, we generate a correct .tmp_kallsyms2.o
249	# 3)  That link may have expanded the kernel image enough that
250	#     more linker branch stubs / trampolines had to be added, which
251	#     introduces new names, which further expands kallsyms. Do another
252	#     pass if that is the case. In theory it's possible this results
253	#     in even more stubs, but unlikely.
254	#     KALLSYMS_EXTRA_PASS=1 may also used to debug or work around
255	#     other bugs.
256	# 4)  The correct ${kallsymso} is linked into the final vmlinux.
257	#
258	# a)  Verify that the System.map from vmlinux matches the map from
259	#     ${kallsymso}.
260
261	kallsymso=.tmp_kallsyms2.o
262	kallsyms_vmlinux=.tmp_vmlinux2
263
264	# step 1
265	vmlinux_link "" .tmp_vmlinux1
266	kallsyms .tmp_vmlinux1 .tmp_kallsyms1.o
267
268	# step 2
269	vmlinux_link .tmp_kallsyms1.o .tmp_vmlinux2
270	kallsyms .tmp_vmlinux2 .tmp_kallsyms2.o
271
272	# step 3
273	size1=$(stat -c "%s" .tmp_kallsyms1.o)
274	size2=$(stat -c "%s" .tmp_kallsyms2.o)
275
276	if [ $size1 -ne $size2 ] || [ -n "${KALLSYMS_EXTRA_PASS}" ]; then
277		kallsymso=.tmp_kallsyms3.o
278		kallsyms_vmlinux=.tmp_vmlinux3
279
280		vmlinux_link .tmp_kallsyms2.o .tmp_vmlinux3
281
282		kallsyms .tmp_vmlinux3 .tmp_kallsyms3.o
283	fi
284fi
285
286info LD vmlinux
287vmlinux_link "${kallsymso}" vmlinux
288
289if [ -n "${CONFIG_BUILDTIME_EXTABLE_SORT}" ]; then
290	info SORTEX vmlinux
291	sortextable vmlinux
292fi
293
294info SYSMAP System.map
295mksysmap vmlinux System.map
296
297# step a (see comment above)
298if [ -n "${CONFIG_KALLSYMS}" ]; then
299	mksysmap ${kallsyms_vmlinux} .tmp_System.map
300
301	if ! cmp -s System.map .tmp_System.map; then
302		echo >&2 Inconsistent kallsyms data
303		echo >&2 Try "make KALLSYMS_EXTRA_PASS=1" as a workaround
 
304		exit 1
305	fi
306fi
307
308# We made a new kernel - delete old version file
309rm -f .old_version

  1#!/bin/sh
  2#
  3# link vmlinux
  4#
  5# vmlinux is linked from the objects selected by $(KBUILD_VMLINUX_INIT) and
  6# $(KBUILD_VMLINUX_MAIN). Most are built-in.o files from top-level directories
  7# in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
  8# Ordering when linking is important, and $(KBUILD_VMLINUX_INIT) must be first.
  9#
 10# vmlinux
 11#   ^
 12#   |
 13#   +-< $(KBUILD_VMLINUX_INIT)
 14#   |   +--< init/version.o + more
 15#   |
 16#   +--< $(KBUILD_VMLINUX_MAIN)
 17#   |    +--< drivers/built-in.o mm/built-in.o + more
 18#   |
 19#   +-< ${kallsymso} (see description in KALLSYMS section)
 20#
 21# vmlinux version (uname -v) cannot be updated during normal
 22# descending-into-subdirs phase since we do not yet know if we need to
 23# update vmlinux.
 24# Therefore this step is delayed until just before final link of vmlinux.
 25#
 26# System.map is generated to document addresses of all kernel symbols
 27
 28# Error out on error
 29set -e
 30
 31# Nice output in kbuild format
 32# Will be supressed by "make -s"
 33info()
 34{
 35	if [ "${quiet}" != "silent_" ]; then
 36		printf "  %-7s %s\n" ${1} ${2}
 37	fi
 38}
 39
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 40# Link of vmlinux.o used for section mismatch analysis
 41# ${1} output file
 42modpost_link()
 43{
 44	${LD} ${LDFLAGS} -r -o ${1} ${KBUILD_VMLINUX_INIT}                   \
 45		--start-group ${KBUILD_VMLINUX_MAIN} --end-group
 
 
 
 
 
 
 
 
 
 46}
 47
 48# Link of vmlinux
 49# ${1} - optional extra .o files
 50# ${2} - output file
 51vmlinux_link()
 52{
 53	local lds="${objtree}/${KBUILD_LDS}"
 
 54
 55	if [ "${SRCARCH}" != "um" ]; then
 56		${LD} ${LDFLAGS} ${LDFLAGS_vmlinux} -o ${2}                  \
 57			-T ${lds} ${KBUILD_VMLINUX_INIT}                     \
 58			--start-group ${KBUILD_VMLINUX_MAIN} --end-group ${1}
 
 
 
 
 
 
 
 
 
 59	else
 60		${CC} ${CFLAGS_vmlinux} -o ${2}                              \
 61			-Wl,-T,${lds} ${KBUILD_VMLINUX_INIT}                 \
 62			-Wl,--start-group                                    \
 63				 ${KBUILD_VMLINUX_MAIN}                      \
 64			-Wl,--end-group                                      \
 65			-lutil ${1}
 
 
 
 
 
 
 
 
 66		rm -f linux
 67	fi
 68}
 69
 70
 71# Create ${2} .o file with all symbols from the ${1} object file
 72kallsyms()
 73{
 74	info KSYM ${2}
 75	local kallsymopt;
 76
 77	if [ -n "${CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX}" ]; then
 78		kallsymopt="${kallsymopt} --symbol-prefix=_"
 79	fi
 80
 81	if [ -n "${CONFIG_KALLSYMS_ALL}" ]; then
 82		kallsymopt="${kallsymopt} --all-symbols"
 83	fi
 84
 85	if [ -n "${CONFIG_ARM}" ] && [ -n "${CONFIG_PAGE_OFFSET}" ]; then
 86		kallsymopt="${kallsymopt} --page-offset=$CONFIG_PAGE_OFFSET"
 87	fi
 88
 89	if [ -n "${CONFIG_X86_64}" ]; then
 90		kallsymopt="${kallsymopt} --absolute-percpu"
 91	fi
 92
 93	local aflags="${KBUILD_AFLAGS} ${KBUILD_AFLAGS_KERNEL}               \
 94		      ${NOSTDINC_FLAGS} ${LINUXINCLUDE} ${KBUILD_CPPFLAGS}"
 95
 96	${NM} -n ${1} | \
 97		scripts/kallsyms ${kallsymopt} | \
 98		${CC} ${aflags} -c -o ${2} -x assembler-with-cpp -
 
 99}
100
101# Create map file with all symbols from ${1}
102# See mksymap for additional details
103mksysmap()
104{
105	${CONFIG_SHELL} "${srctree}/scripts/mksysmap" ${1} ${2}
106}
107
108sortextable()
109{
110	${objtree}/scripts/sortextable ${1}
111}
112
113# Delete output files in case of error
114trap cleanup SIGHUP SIGINT SIGQUIT SIGTERM ERR
115cleanup()
116{
117	rm -f .old_version
118	rm -f .tmp_System.map
119	rm -f .tmp_kallsyms*
120	rm -f .tmp_version
121	rm -f .tmp_vmlinux*
 
122	rm -f System.map
123	rm -f vmlinux
124	rm -f vmlinux.o
125}
126
 
 
 
 
 
 
 
 
 
 
 
 
 
 
127#
128#
129# Use "make V=1" to debug this script
130case "${KBUILD_VERBOSE}" in
131*1*)
132	set -x
133	;;
134esac
135
136if [ "$1" = "clean" ]; then
137	cleanup
138	exit 0
139fi
140
141# We need access to CONFIG_ symbols
142case "${KCONFIG_CONFIG}" in
143*/*)
144	. "${KCONFIG_CONFIG}"
145	;;
146*)
147	# Force using a file from the current directory
148	. "./${KCONFIG_CONFIG}"
149esac
150
151#link vmlinux.o
152info LD vmlinux.o
153modpost_link vmlinux.o
154
155# modpost vmlinux.o to check for section mismatches
156${MAKE} -f "${srctree}/scripts/Makefile.modpost" vmlinux.o
157
158# Update version
159info GEN .version
160if [ ! -r .version ]; then
161	rm -f .version;
162	echo 1 >.version;
163else
164	mv .version .old_version;
165	expr 0$(cat .old_version) + 1 >.version;
166fi;
167
168# final build of init/
169${MAKE} -f "${srctree}/scripts/Makefile.build" obj=init
 
 
 
 
 
 
 
 
 
170
171kallsymso=""
172kallsyms_vmlinux=""
173if [ -n "${CONFIG_KALLSYMS}" ]; then
174
175	# kallsyms support
176	# Generate section listing all symbols and add it into vmlinux
177	# It's a three step process:
178	# 1)  Link .tmp_vmlinux1 so it has all symbols and sections,
179	#     but __kallsyms is empty.
180	#     Running kallsyms on that gives us .tmp_kallsyms1.o with
181	#     the right size
182	# 2)  Link .tmp_vmlinux2 so it now has a __kallsyms section of
183	#     the right size, but due to the added section, some
184	#     addresses have shifted.
185	#     From here, we generate a correct .tmp_kallsyms2.o
186	# 2a) We may use an extra pass as this has been necessary to
187	#     woraround some alignment related bugs.
188	#     KALLSYMS_EXTRA_PASS=1 is used to trigger this.
189	# 3)  The correct ${kallsymso} is linked into the final vmlinux.
 
 
 
 
190	#
191	# a)  Verify that the System.map from vmlinux matches the map from
192	#     ${kallsymso}.
193
194	kallsymso=.tmp_kallsyms2.o
195	kallsyms_vmlinux=.tmp_vmlinux2
196
197	# step 1
198	vmlinux_link "" .tmp_vmlinux1
199	kallsyms .tmp_vmlinux1 .tmp_kallsyms1.o
200
201	# step 2
202	vmlinux_link .tmp_kallsyms1.o .tmp_vmlinux2
203	kallsyms .tmp_vmlinux2 .tmp_kallsyms2.o
204
205	# step 2a
206	if [ -n "${KALLSYMS_EXTRA_PASS}" ]; then
 
 
 
207		kallsymso=.tmp_kallsyms3.o
208		kallsyms_vmlinux=.tmp_vmlinux3
209
210		vmlinux_link .tmp_kallsyms2.o .tmp_vmlinux3
211
212		kallsyms .tmp_vmlinux3 .tmp_kallsyms3.o
213	fi
214fi
215
216info LD vmlinux
217vmlinux_link "${kallsymso}" vmlinux
218
219if [ -n "${CONFIG_BUILDTIME_EXTABLE_SORT}" ]; then
220	info SORTEX vmlinux
221	sortextable vmlinux
222fi
223
224info SYSMAP System.map
225mksysmap vmlinux System.map
226
227# step a (see comment above)
228if [ -n "${CONFIG_KALLSYMS}" ]; then
229	mksysmap ${kallsyms_vmlinux} .tmp_System.map
230
231	if ! cmp -s System.map .tmp_System.map; then
232		echo >&2 Inconsistent kallsyms data
233		echo >&2 Try "make KALLSYMS_EXTRA_PASS=1" as a workaround
234		cleanup
235		exit 1
236	fi
237fi
238
239# We made a new kernel - delete old version file
240rm -f .old_version